Sheertex, Amazon, Ulla Popken Tights from Sheertex, Hue and Ulla Popken. She was clad in a voluminous brilliant blue caftan topped off with a green cardigan — but what really sparked a shopping urge were her semi-opaque, cobalt blue tights. Not everyone may feel totally comfortable sporting head-to-toe color like Peck, but the idea of adding a bright spot to …